A machine includes a power system having a prime mover drivingly connected to an electric generator, a power line operably connected to the electric generator, and a first electrical energy storage device operable to exchange electricity with the power line. The power system may also include a second electrical energy storage device and power-system controls. The power-system controls may include a power regulator and at least one information processor configured to receive information related to at least one operating parameter of the power system and control the power regulator based on the received information, including selectively controlling the power regulator to receive electricity from the second electrical energy storage device and supply the electricity to the first electrical energy storage device.